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Physical Science
2nd semester test
| Question | Answer |
|---|---|
| "No, No - don't touch" would be | Conduction |
| Blowing air would be | Convection |
| The speed that an EM wave travels is | speed-o-light |
| "Heat" is just | energy |
| Hot always goes... | from hot to cold |
| A vibration that is moving laterally from a point is called a | wave |
| Hertz is another name for | frequency |
| EM waves occur when energy is given off by | electrons |
| Photons are | packets of light energy |
| A "wiggle" is a | vibration |
| A 25000Hz wave form is travelling through a medium at 340M/s. You need to find the legth of each wave. How would solve this problem? | divide 340M/s by 25000Hz |
| If the volume of a tuning fork increases, then | the amplitude of the wave is increasing |
| What happens if the TROUGH of one wave lines up with the CREST of another wave | the volume of the two waves will be diminished - maybe even cancelled |
| In a transverse wave, the medium is displaced | perpendicular to the flow of the energy |
| Select the best answer for this question. A sound wave can also be called | a. compressional wave b. longitudinal wave c. ALL OF THESE d. mechanical wave |
| 20,000 waves pass a point in 35 seconds. What is the Frequency | 20,000 / 35 = 571.4 Hz |
| "In space, no one can hear you scream" - why? | there is no medium in space - thus sound cannot travel |
| When you produced a Longitudinal wave in your slinky, you moved your hand | in a "push and pull" manner |
| LIGHT would be considered a | transverse wave |
| 72000 Hz wave traveling at 1002 M/s. What is the wavelength? | 1002M/s / 72000 Hz = 0.0139 M |
| The outgoing ray leaving a medium ... | is at an angle equal to the incoming ray |
| Objects are clear because | the electrons can vibrate at the same frequency as the light |
| "Bending" light that is travelling through a medium is called | refraction |
| why when light enters glass, does the speed change? | electrons transfer the energy to following electrons - this takes time. More time = lowered speed |
| a "medium" is | anything a wave finds itself in |
| How are light waves produced | electrons emit photons |
| what causes the beautiful red/yellow/orange sunsets and sunrises ? | red/yellow/orange light is long wave - so these colors can penetrate longer distances of atmosphere found at sunrise and sunset |
| By what physics method does a light ray "bend" when a ray enters a different medium? | the first part of the ray front to hit the medium slows down, the following part of the ray front still moving at S-o-L enters later = bending |
| When light enters a different medium what happens | the light speed changes |
| What would be the charge of an atom if it had 3 protons and 7 electrons | negative 4 |
| In solids, which particle can move | electrons |
| if two negatively charged balloons are hanging near each other, what would be the most likely outcome | the balloons would move away from each other |
| Thunder results from | air gets superheated, expands and then collapses back on itself |
| When a balloon sticks to the door after being rubbed on someone's head, what is the most plausible explanation | electrons have been transferred to the balloon and are causing electrons on the door to move, exposing protons = sticking balloon |
| Electrons always go | the path of least resistance |
| When the switch is in the off position, where are the electrons? | still in the conductor |
| Electricity will always follow the | path of least resistance |
| Moving electrons produces | a. magnetism b. ALL OF THESE c. "electricity" |
| To produce "electricity" in a solid - you must have | a conductor, electrons moving along a desired path, and a reason for the electrons to move from where they are |
| one of the neat properties of metals is | metals allow electrons to move freely |
| A bird can sit on a wire carrying extreme amounts of electricity because | the bird has become part of the circuit - in other words, he is part of the path of least resistance |
| How much power is used if 100 Amps is carried along a wire at 120 volts | 12,000 Watts |
| How many Amps will be carried in a wire with 47 Volts with 2000 Ohms resistance | 0.0235 Amps |
| How many electrons will Praseodymium have if the element has 14 Protons | 14 electrons |
| That we are "brothers and sisters of the stars" is true because | a. matter cannot be destroyed b. matter is made of atoms c. we are just "caretakers" of the matter that makes us d. ALL OF THESE e. new matter cannot be created |
| According to the Greeks, ATOMOS means | unable to be cut or divided |
| How many volts occur if a wire has a resistance of 10,000 Ohms, and 14 amps is pushed through the wire? | 140,000 VOLTS |
| What would be the resistance if a wire carried 100,000 V at 0.92 Amps? | 108695.65 Ohms |
| If a material has a "half life" of 30,000 years.... AND your sample indicates that 3 "half lives" have passed, how old is the sample | 90,000 years |
| The cool thing about Isotopes is that they can be used as | clocks |
| an "Isotopic Ratio" is | the ratio of Parental to Daughter Isotopes in a sample |
| what matter makes Gold | no other matter makes Gold |
| Elements are defined as | matter composed of only one type of atom |
| An atom that has a charge is called a/an | ion |
| Why do atoms have a "charge" | too many or too few electrons |
| In order to be neutral, an atom must have | an equal number of electrons and protons |
| Roughly how many elements make up the VAST majority of everything in this room? | less than 20 |
| If a rock sample has an isotopic ratio of 1PI to 2DI, and the half life is 500,000 years - how old is the sample | 1,000,000 years |
| Let's get metaphysical here ...... would it be true to say that EVERY gold atom that ever will be is ALREADY in existance???????????? | yes |
| Elements | were created only once |
| Roughly how many elements are there | just over 100 |
| Salt and sand | is a mixture because neither the sand nor the salt is bonded together |
| What would call a combination of elements in which each element retains it's own properties | mixture |
| Water out of the faucet is | actually a mixture because some of the impurities in faucet water are NOT chemically combined with Hydrogen and Oxygen |
| what is the connection that takes place between the constituent elements in a compound called in scientific terms? | bonding |
| What do you call a combination of elements where each of the elements lose their own properties / identity | compound |
| PURE water | is a compound because Hydrogen and Oxygen are chemically bonded to each other |
Created by:
amandafjeld
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